suyu/src/core/hle/kernel/condition_variable.cpp

65 lines
2 KiB
C++

// Copyright 2018 Yuzu Emulator Team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/assert.h"
#include "core/hle/kernel/condition_variable.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/object_address_table.h"
#include "core/hle/kernel/thread.h"
namespace Kernel {
ConditionVariable::ConditionVariable() {}
ConditionVariable::~ConditionVariable() {}
ResultVal<SharedPtr<ConditionVariable>> ConditionVariable::Create(VAddr guest_addr,
VAddr mutex_addr,
std::string name) {
SharedPtr<ConditionVariable> condition_variable(new ConditionVariable);
condition_variable->name = std::move(name);
condition_variable->guest_addr = guest_addr;
condition_variable->mutex_addr = mutex_addr;
// Condition variables are referenced by guest address, so track this in the kernel
g_object_address_table.Insert(guest_addr, condition_variable);
return MakeResult<SharedPtr<ConditionVariable>>(std::move(condition_variable));
}
bool ConditionVariable::ShouldWait(Thread* thread) const {
return GetAvailableCount() <= 0;
}
void ConditionVariable::Acquire(Thread* thread) {
if (GetAvailableCount() <= 0)
return;
SetAvailableCount(GetAvailableCount() - 1);
}
ResultCode ConditionVariable::Release(s32 target) {
if (target == -1) {
// When -1, wake up all waiting threads
SetAvailableCount(GetWaitingThreads().size());
WakeupAllWaitingThreads();
} else {
// Otherwise, wake up just a single thread
SetAvailableCount(target);
WakeupWaitingThread(GetHighestPriorityReadyThread());
}
return RESULT_SUCCESS;
}
s32 ConditionVariable::GetAvailableCount() const {
return Memory::Read32(guest_addr);
}
void ConditionVariable::SetAvailableCount(s32 value) const {
Memory::Write32(guest_addr, value);
}
} // namespace Kernel